软件水平考试

【单选题】For each blank, choose the best answer from the four choices and write down on the answer sheet.
(71) is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string.
(72) is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection.
(73) is an approach preferred by cable TV providers. In this solution the fiber terminates at an optoelectrical converter and the final segment is a shared coaxial cable.
(74) is a device used to connect two separate network that use different communication protocol.
(75) is a digital-to-digital polar encoding method in which the signal level is always either positive or negative.
ADSL
B．FTTC

C、HFC
D．FTTH

网考网参考答案：C
网考网解析：
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